import java.util.Scanner;

public class Main {
    static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        int n = scanner.nextInt();
        Solution solution = new Solution();
        System.out.println(solution.convertToTitle(n));
    }

    public static void main1(String[] args) {
         String s = scanner.nextLine();
         Solution1 solution = new Solution1();
         solution.doesAliceWin(s);
    }
}

class Solution {
    public String convertToTitle(int columnNumber) {
        char c;
        StringBuffer stringBuffer = new StringBuffer();
        while(columnNumber != 0){
            c = (char)(columnNumber % 10 - 1 + 'A');
            columnNumber /= 10;
            stringBuffer.append(c);
        }
        return stringBuffer.toString();
    }
    
}

class Solution1 {
    public boolean doesAliceWin(String s) {
        String c = "aeiou";
        for (char a : s.toCharArray()){
            if(c.indexOf(a) != -1){
                return true;
            }
        }
        return false;
    }
}